Drilling mechanism



Nov. 7, 1933. M. P. HOLMES DRILL'ING MECHANISM Nov., 7, 1933. M, P. HOLMES. I 1,933,589

DRILLING MECHANISM Filed Feb. 20. 1928 4 Sheets-Sheet 2 M3 1M 1455546 1519i 6 f 20 v 3 ,f 4 13:5/

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DRILLING MEGHANISM Filed Feb. 20, 1928 4 Sheets-Sheet 4 (il L/ l/ Patented Nov. 7, 1933 PATENT OFFICE l DRILLING MECHANISM Morris P. Holmes, Claremont, N. H., assignor to Sullivan Machinery Company, a. corporation of Massachusetts Application February zo, 192s. serial'No. 255,754

23 Claims.

This invention relates from one aspect to drilling mechanism and from another to clutch mechanisms especially adapted to drill mechanisms, but also of other applicability.

An object of this invention is to provide an improved rotary drilling tool. Another object is to provide an improved drilling tool of the rotary type having improved feeding and adjustable supporting means therefor. A further object is to provide an improved rotary drilling tool especially adapted for use in conjunction with la mining machine for drilling shot or blast holes in the coal face preparatory to the shooting of the coal from the solid. Still `another object is to provide an improved feeding mechanism of the diierential screw type whereby the drilling implement may be fed positively in opposite directions at different speeds, the diierential screw feeding mechanism being automatically controlled by the resistance to rotation of the drilling implement and the feed is automatically reversed when the resistance to rotation exceeds a predetermined degree. A still further object of the invention is to provide an improved clutch arrangement having improved controlling means. These and other objects and advantages of this invention will however subsequently more fully appear.

In the accompanying drawings there is shown for purposes of illustration one embodiment which the invention may assume in practice.

In these drawings,-

Fig. 1 is a side elevational View of a coal cutting machine of the so-called universal type with which the improved drilling tool is incorporated, the drilling tool being shown in its lowered or transport position.

Fig. 2 is an enlarged detailed sectional view taken substantially through the longitudinal center of the machine and illustrating the driving connections between the mining machine driving motor and the drilling tool.

Fig. 3 is a transverse vertical sectional View taken on line 3 3 of Fig. 2.

Fig. 4 is a detail sectional View taken on line .L-4 of Fig. 3.

Fig. 5 is a horizontal sectional view taken substantially on line 5-5 of Fig. 2.

Fig. 6 is a detail sectional view taken on line 66 of Fig. 5.

Fig. l is a detail sectional View taken on line 7-7 of Fig. 2.

Fig. 8 is a detail sectional view taken on line 8--8 of Fig. 2.

Fig. 9 is a central longitudinally extending.

vertical sectional view taken through the improved drilling tool and the driving connections therefor.

Fig. 10 is a transverse vertical sectional View taken substantially on line 10-10 of Fig. 9.

F'g. 11 is a horizontal sectional view, parts being shown in elevation, taken substantially on line 11-11 of Fig. 9.

Fig. l2 is a transverse vertical sectional view partly in elevation, taken on line 12-12 of Fig. 11.

Fig. 13 is a detail sectional View taken on line 13-13 of Fig. 10.

Fig. 14 is a detail sectional view taken on line 14-14 of Fig. 9.

Fig. 15 is a detail sectional view taken through the drill chuck with the cutting tool removed.

Figs. 16 and 17 are detail sectional views taken on lines 16-16 and 17-17 respectively of Fig. 15.

Figs. 18 and 19 are diagrammatic views illustrating the drilling operative positions of the drilling tool in a mine.

In this illustrative embodiment of the invention there is shown a drilling tool generally designated i which is an improvement over the drilling tool described and claimed in my copending application, Serial No. 200,826, led June 23, 1927, the drilling tool being carried by improved adjustable supporting means 2 :'n turn adjustably mounted on a portable support, herein a coal mining machine 3. The coal mining machine 3 may assume various forms, but for purposes of illustration there is shown a mining machine of the type described in my copending application, Serial No. 137,600, filed September 24, 1926, now matured into Patent No. 1,785,961, patented Dec. 23, 1930, the coal mining machine being of the so-called universa type adapted to insert horizontal and shear cuts in the coal face. This machine generally comprises a body or frame 4 adjustably mounted on wheels 5 adapted to run along a mine trackway 6. Supported on the forward end of the frame 4 is a cutter carrying head 7 rotatable about a substantially horizontal axis extending longitudinally of the machine and having pivotally mounted thereon for swinging movement relative thereto a cutter chain carrying cutter bar 8. Housed within the frame 4 is a usual driving motor, herein preferably of the reversible electrical type, having its power shaft 9 extending longitudinally of the machine frame and driving through suitable connections, clearly described in my copending application Serial No. 137,600 mentioned above, the cutting mechanism, the truck wheel driving mechanism, and all the other various mechanisms of the machine. As

this coal cutting machine per se does not constitute part of the invention except as it cooperates with the novel mechanism to be described and forms no part of the novel combination, further descripton of the same is herein considered unnecessary.

Referring to the improved rotary drilling tool and more particularly to the improved -driving connections and adjustable supporting means therefor, it will herein be noted that fixed at 10 to the rear end of the power shaft 9 of the m'ning machine driving motor (see Fig. 2) is a spur pinion 11 which meshes with a spur gear 12 herein preferably formed integral with a hollow shaft 13. As illustrated, the shaft 13 :'s rotatably mounted on suitable ball bearings supported by a horizontal shaft 14 arranged coaxial with the shaft 13 and above and parallel with the power shaft 9 of the motor. Also formed integral with the shaft 13 and rotatable with the spur gear 12 is a bevel gear 15 which meshes with a bevel gear 16 fixed at 17 to a vertical drive shaft 18. The shaft 18 is journaled in spaced alined ball bearings 19 suitably supported by a horizontal turntable, herein in the form of a swivel frame or housing 20. The housing 20 is mounted for rotation relatve to the mining machine frame 4 about a vertical axis coincident to the axis of the shaft 18 and is journaled on rollers 2l carried by a circular base plate 22 of the housing 20. The rollers 21 are guided in an annular recess or raceway suitably formed withn the machine frame 4. The rollers 21 are maintained in position by means of an annular retaining plate or ring 23, herein preferably composed of two parts, secured to the machine frame 4 by suitable screws 24. Again referr'ng to the driving connections for the drilling tool 1, it will be observed that arranged above and in longitudinal alinement with the shaft 18 is a drive shaft 26 journaled in alined call bearngs 27 likewise suitably supported within the swivel housing 20. The shafts 18 and 26 are connectible together for simultaneous rotation by means of a suitable clutch device comprising clutch members 28 and 29 formed on the adjacent ends of the shafts 18 and 26, respectively. Surrounding the shafts 18 and 26 is a shfftable clutch member 30 having internal clutch teeth which are adapted to cooperate with the teeth of the clutch members 28 and 29. Cooperating with this shiftable clutch member 30 is a pivoted shipper yoke 31 (see also Fig. 5) xed to a hor'zontal shaft 32 rotatably mounted within the swivel housing 20 and carrying at its outer end a crank or arm 33 having its outer end slotted as at 34. Cooperating with this slot is an eccentric pin or crank 35 carried by a rotatable disc 36 formed on a horizontal actuating shaft 37. As clearly shown in Fig. 5, the shaft 37 is rotatably mounted in a bearing sleeve 38 carried by the swivel housing 20 and this shaft has secured thereto at its outer end an operating handle 39. The handle 39 is weighted at its extremity and when it is swung into its different positions its I weight maintains the clutch member 30 in either its in or out position. Thus it will be evident that when the operator grasps the handle 39 and rotates the shaft 37, the crank 33 is swung upwardly or downwardly by the eccentric pin and slot connection and as a result the clutch member 30 is moved axially and the clutch members 28 and 29 are either connected or disconnected. Thus it is obvious that the shafts 18 and 26 may be connected or disconnected at will.

As clearly shown in Fig. 2, the shaft 26 has fixed thereto at its upper end by a key 40 a bevel pinion 41 meshing with a bevel gear 42 (see also Fig. 5) rotatably mounted on.ball bearings 43 supported on a horizontal shaft 44 extending transversely of the swivel housing 20 and supported thereby. The bevel gear 42 meshes with a bevel gear 45 fixed at 46 to a shaft 47 which its herein the main driving shaft for the drilling ool 1. driving shaft 47 is journaled at its opposite ends in ball bearings 48 and 49, the ball bearings 48 being supported by an adjustable tubular supporting arm or boom 50 while the bearings 49 are supported by a frame or swivel bearing bracket 51 secured to the outer end of the arm 50 and on which the drilling tool is swiveled as will later be described. In this instance the tubular supporting arm 50 surrounds the shaft 47 and is journaled for rotation about its longitudinal axis at its rear end in spaced alined ball bearings 52 and 53 carried by a plural part casing or housing 54, herein swiveled or pivoted on a horizontal axis at 55 (see Fig. 5) for angular swinging movement in a vertical plane relative to the swivel casing 20. As shown in Fig. 9, the outer extremity of the tubular supporting arm 50 is rigidly fixed by screws 57 to the drill supporting bracket 51 on which the drilling tool is swiveled.

In accordance with this illustrative embodiment of the invention the outer end of the main driving shaft 47 has xed thereto at 58 a bevel pinion 59 meshing with a larger bevel ring gear 60. The bevel ring gear 60 is rotatable about an axis perpendicular to the axis of the driving shaft 47 and is journaled on a ball bearing 61 supported by a bearing bracket 62 and a swivel plate 63. The swivel plate 63 is rigidly secured by screws 64 to the bearing bracket 62. The bevel ring gear 60 is retained in position relative to the ball bearing 61 by means of a locking ring 65, the latter having a radial flange projecting within an annular groove in the bevel ring gear 60. The swivel plate 63 is herein rotatably mounted in a bore 66 arranged concentrically with the bevel gear 60 and formed Within the bracket 51 and is provided with a peripheral groove 67 with which a clamp or set screw 6 8 is adapted to engage to clamp the swivel plate 63 in its different adjusted positions rigidly to the bracket 51. The set screw 68 is threadedly connected to the bracket 51 and has pivotally connected thereto a suit- As shown in Figs. 2 and 9, the mainv able operating handle 69. As illustrated, thebevel ring gear 60 meshes with a bevel gear 70 fixed at 71 to a shaft 72 disposed in advance of and in the plane of the main driving shaft 47. The shaft 72 is journaled in ball bearings 73 carried by the bearing bracket 62. Also fixed to the shaft 72 adjacent the bevel gear is a spur gear 74 while formed integral with the opposite end of the shaft 72 is a spur gear 75, the spur gears 74 and 75 constituting the driving elements for the improved tool rotating and feeding mechanisms. As clearly shown in Fig. 9, the spur gear 74 meshes with a spur gear 77 rotatably mounted on a bearing sleeve 78. The gear 77 has a sleeve portion carrying a series of clutch discs 79 interleaved with a corresponding series of clutch discs 80 carried by a rotatable drive sleeve or spider 81. The drive sleeve 81 is journaled in ball bearings 82 and 83, the latter being carried by the bearing bracket 62 while the bearing 82 is suitably supported within a plural part drill housing or casing 84. The casing 84 iS provided with an annular flange 85 rotatably mounted in a bore 86 alined with the bore 66 and also formed in the supporting bracket 51, the casing 84 being suitablyconnected to and rotatable with the swivel plate 63. Supported on the drive sleeve 81 and in turn supporting the bearing sleeve 78 is a retaining sleeve or bushing 88 interposed between the clutch discs and the bearing 83. The drive sleeve 81 is held against axial displacement by means of an annular ring 89 engaging the inner surface of the inner ball race of the bearing 83. The forward end of the drive sleeve 81 is provided with a shoulder 90 engaging the inner race of the ball bearing 82. As illustrated, the forward end of the casing 84 is closed by a suitable cap and bearing retaining member 91 carrying a suitable packing ring 92 interposed between the cap and the drive sleeve 81, this packing ring preventing access of dirt to the bearing 82 and other working parts and also preventing leakage of oil from the casing. Encircling the drive sleeve 81 and slidably mounted thereon is a clutch applying member 93 normally held in clutch applying position by a coiled spring 94 encircling the drive sleeve 81 and reacting against a sleeve 95 abutting an adjustable sleeve 96 threadedly connected to the rotatable drive sleeve 81. The mechanism for releasing the drill clutch will later be described. As shown, the rotatable drive sleeve 81 has inwardly projecting keys 97 engaging longitudinal utes or keyways 98 formed on the periphery of a tubular driving sleeve or shaft 99 which carries at its forward end a tool chuck generally designated 100, to be later described in detail, which in turn carries a usual rotary drilling implement 101.

As shown, the gear meshes with a spur gear 102 slightly larger in diameter than the gear 77, this gear 102 being rotatably mounted on a bearing sleeve 103. The gear 102 has a sleeve portion which carries a series of clutch discs 104 which are interleaved with a corresponding series of clutch discs 105 carried by a sleeve or tubular drive member 106 rotatably mounted in the spaced alined bearings 107 suitably carried within the drill housing 84. Surrounding the tubular drive member 106 and supporting the bearing sleeve 103 is a retaining sleeve or bushing 108 similar to the retaining sleeve 88. A split ring similar to the split ring 89 is also provided for preventing axial displacement of the tubular member 106. As shown, the tubular member 106 is provided with a radial flange 109 interposed between the inner race of the contiguous ball bearing 107 and a ball thrust bearing 110, the latter being carried within a cap and bearing retaining plate 111 similar to the cap 91 and likewise carrying a packing ring 112. Surrounding the tubular member or sleeve 106 is a rotatable sleeve or spider 113 having slidably mounted thereon a clutch applying member 114 normally held in clutch applying position by a coiled spring 115 encircling the sleeve 113 and reacting against a sleeve 116 engaging an adjustable sleeve 117 threadedly connected to the sleeve 113. The mechanism for releasing the feed clutch will later be described. In accordance with this illustrative form of the invention, the tubular member or drive sleeve 106 is threadedly connected at its rear end at 118 to a member 119 in turn having fixed thereto at 120 a feed screw 121, the latter extending centrally through the tubular drive sleeve 99. Threadedly connected to the rear end of the feed screw 121 is a suitable cap member 122 housing a lock nut 123 which maintains the feed screw against axial movement relative to the member 119. The rear end of the tubular member 99 is threadedly connected at 124 to the feed screw 121.

The mechanism for releasing the drill and feed friction clutches '79, 80 and 104, 105 respectively comprises an operating member 126 having a pivoted operating handle 127, the operating member 126 being fixed at 128 to a shaft 129 rotatably supported by the swivel plate 63. The shaft 129 has formed integral therewith a cam disc 130 having formed thereon cam surfaces or arcuate notches 131, 131EL and 131b and suitable positioning or locating notches 132. Engageable with the cam surfaces are cam levers 133 and 133a fixed at 134 to parallel shafts 135 and 135a (see also Fig. 10) rotatably mounted at 136 within the drill housing 84. The other ends of the shafts 135, 135a have formed thereon arms or levers 137 and 137EL (see Fig. 11) movable in opposite directions and engaging the ends of reciprocable rods or plungers 138 and 139 slidably mounted within the drill housing 84. These plungers 138 and 139 engage shipper yokes 140 and 141 respectively, the yokes 140 and 141 also pivotally engaging at 142 suitable stop members 142a secured to the drill housing. These shipper yokes are pivotally connected to the clutch applying members 93 and 124 respectively. It will be noted that the notches 132 maintain the shipper yokes in their different adjusted positions. From the foregoing it will be evident that when the operator grasps the handle 127 and turns the cam disc 130, the cam levers 133 and 133a are swung outwardly, thereby rotating the shafts 135 and 1358. 135 and 135 causes swinging movement of the levers 137 and 137a in opposite directions, thereby effecting movement of the plungers 138 and 139 in opposite directions and in turn swinging the shipper yokes to release the drill and feed clutches. When the operating handle 127 is swung into released position, the clutches are automatically applied by the coiled springs 94 and 115. Also the clutches may be selectively released.

Referring more particularly to the improved adjustable supporting means for the drilling tool, it will be observed that the swivel casing 54 to which the rear end of the tubular arm 50 is pivotally connected is provided with arms 143 located at opposite sides of the swivel housing 20 (see Fig. 5). These arms are pivotally mounted on ball bearings 144 supported by cylindrical lateral projections 145 preferably formed integral with the detachable side covers 146 of the swivel casing 20. It is therefore obvious that the supporting arm 50 together with the drilling tool supported thereby may be swung upwardly or downwardly in a vertical plane about a horizontal axis relative to the swivel casing 20. The mechanism for effecting swinging movement of the supporting arm and drill comprises a vertical rib or projection 147 (see Fig. 2) projecting upwardly from the casing 54 and having pivotally connected thereto at 148 parallel link members or arms 149, the latter in turn being pivotally connected at 150 to a slidable trunnion member or block 151. As clearly shown in Figs. 2 and 8, the trunnion block 151 is slidably mounted within parallel guideways 152 formed on a supporting bracket 153 extending between the arms 149 and herein preferably formed integral with the swivel casing 29. The trunnion block 151 is in the form of a nut having internal threads 154 cooperating with an adjusting' screw 155. This adjusting Rotation of the shafts 20 Y This drill rotating means comprises a worm gear screw is rotatably mounted within a bearing sleeve 156 carried by the bracket 153 and has fixed thereto a ratchet 157 having external ratchet teeth 158. Cooperating with these ratchet teeth is a reversible pawl 159 suitably secured to a rotatable shaft 160 carried by an operating lever 161, the latter being pivotally mounted on an axis coincident to the axis of the adjusting screw 155. Secured to the shaft 160 is an operating lever 162 whereby the pawl 159 maybe shifted from one position to another to permit rotation of the ratchet together with the adjusting screw in opposite directions. Thus it will be evident that upon suitable operation of the ratchet and pawl mechanism the drilling tool may be swung upwardly and downwardly asvdesired.

Improved means are provided for bodily rotating the drill about the axis of the tubular supporting arm which as previously pointed out is rotatably supported within the housing 54.

164 keyed at 165 vto the tubular supporting arm 50 (see Figs. 2 and 3). Meshing with the worm gear 164 is a worm 166 formed integral with a transversely extending hollow shaft 167 journaled at its ends in ball bearings 168 carried by the housing 54. ThisV worm gearing is self-locking and maintains the drill in its different adjusted positions. However, to prevent inadvertent rotation of the worm due to the weight of th'e drill and vibrations set up thereby, a positive lock is provided. This lock comprises clutch teeth 169 engageable with clutch teeth 170 formed on an operating handle 171 keyed at 172 to a shaft 173arranged coaxially with and rotatably mounted in the shaft 167. The clutch teeth 170 also engage locking teeth 174 formed on the relatively stationary housing 54. (see also Fig. 4) The clutch teeth 170 are maintained in engagement with the clutch teeth 169 and locking teeth 174 by means of a coiled spring 175 encircling the shaft 173 and acting between the shaft 167 and an'operating handle 176 keyed at 177 to the end of the shaft 173 opposite from the operating handle 171. When it is desired to bodily rotate the drill about the axis of the tubular supporting arm 50, the operator grasps either of the handles 171, 176 and slides the shaft 173 axially to the right from the position shown in Fig. 3 until the hub of the handle 176 engages the adjacent end of the shaft 167 and thereby releasing the clutch teeth 170 from the locking teeth 174. Then upon turning of the handle the shaft 173, which is still interlocked with the worm 166 by the clutch teeth 170, is rotated, the worm rotating therewith thereby turning the worm-gear 164 and the supporting arm 50 together with the drill supported thereby within the bearings 52 and 53.

As previously pointed out, the drilling tool is supported by the swivel housing 20 and is adapted to swing therewith about a vertical axis. A device is provided for maintaining the swivel housing in its different adjusted positions and this device comprises a block 178 bolted to the bracket 153 formed integral with the swivel housing 20. This block has pivotally connected thereto at 179 a link 180 slotted at 181 throughout a portion of its length. Threadedly connected at 182 to a sliding block 183 is a clamping screw 184, this screw extending through the slot in the link 180 and having an operating handle 185. Interposed between the head of this clamping screw and the link 180 is a clamping plate 186. As illustrated, the block 183 is Slidably mounted on a transversely extending horizontal guide bar 187 evident that the swivel housing 20 may be clamped in its different angular positions.

Now referring to Figs. 15, 16 and 17 illustrating the details of the improved tool chuck 100, it will be noted that threadedly connected at 190 to the forward end of the tubular drive sleeve 99 is a cylindrical chuck casing or sleeve 191 having a bore 192 within which a chuck bushing 193 is rotatably mounted. Interposed between the rear end of the chuck bushing 193 and the forward end of the sleeve-99 is a stop plate 194, the rear end of the chuck bushing abutting against this stop plate while the forward end thereof engages a shoulder 195 formed within the chuck casing. As shown, the chuck bushing v193 has formed therein a polygonal socket 196 adapted to receive the square shank of the drilling implement 101. In this instance the chuck casing 191 has formed therein a series of radial openings 197 in which a plurality of balls or plungers 198 are disposed, these plungers being slidable radially in the openings 197 as hereinafter described. Formed in the chuck bushing 193 on the periphery thereof is a 'series of circumferentially spaced arcuate notches 199. Slidably mounted on the exterior of the chuck casing 191 is a manually operable controlling or operating sleeve 200 having an internal annular groove 201 within which the balls 198 are adapted to enter. Also formed in the casing 191 is a pair of diametrically opposite radial openings 202 which receive balls or slidable plungers 203 which project into an annular groove 204 formed within the operating sleeve 200. Also formed within the sleeve 200 between the groove 2 01 and the inner end of the groove 204 is an annular groove 205. From the foregoing description it is evident that when the operating sleeve 200 is in the position shown in Fig. 15, the chuck casing 191 is free to rotate relative to the chuck bushing 193 which carries the drilling implement. It will further be evident that when the operating sleeve 200 is shifted rearwardly from the position shown in Fig. 15 to the position shown in Fig. 9, the balls or plungers 198 are forced inwardly into the recesses 199 in the chuck bushing, thereby locking the chuck bushing to the casing 191 for rotation therewith and as a result the drilling implement may be driven. When the operating sleeve 200 is in the position shown in Fig. 9, the balls 198 project within the groove 205. The balls 203 and the groove 204 limit longitudinal movement of the operating sleeve 200 in either direction.

In the operation of the improved drilling tool the coal cutting machine is run into the entry and when the coal face is reached the cutter bar 8 is swung to a position at the right hand side of the entry. The cutter par is then sumped into withdrawn from the cut. The driving motor is then stopped and the cutting mechanism is disconnected therefrom. While the cutter bar is in the position shown in Fig. 19, the operator grasps the ratchet lever 161 and oscillates the same, thereby rotating the adjusting screw 155 and moving the trunnion block 151 rearwardly thereby swinging the supporting arm together with the drilling tool upwardly in a vertical plane about its horizontal pivot on the swivel casing 20 from the full line position shown in Fig. 1 to the full line position shown in Fig. 18. The clamping screw 68 is then loosened and the drill swung into the desired angular position relative to the bracket 51 fixed to the forward end of the supporting arm 50, the swivel plate 63 thereafter being clamped in position by the set screw 68. The operator then swings the swivel housing 20 about its vertical axis, thereby moving the tubular supporting arm 50 to the position shown in Fig. 19, the drill being disposed in the full line position as indicated in Fig. 19 at that time. The swivel housing 20 is then locked against further angular movement by the clamping screw 184, the link 180 connected to the swivel housing being rigidly clamped to the block 183. The operator then manipulates the lever 39 swinging the shipper yoke 31 and sliding the clutch member 30 axially, thereby connecting the clutch members 28 and 29 on the drive shafts 18 and 26 together, and as a result the drilling tool is connected to the driving motor. The operator then starts the motor and thereafter grasps the lever 127 and turns the cam disc 130 until the cam lever 133a moves within the ca m groove 131e, the cam lever 133 being forced outwardly into engagement with one of the positioning notches 132 and as a result the friction feed clutch 104, 105 is released and the drill clutch 79, 80 is applied and resultantly the drilling implement is fed forwardly at a relatively high speed. The drilling implement is driven at that time through the gearing 11, 12, the bevel gearing 15, 16, 41, 42, 45, shaft 47, the bevel gearing 59, 60, 70 and gearing 74, 77

- through the friction drill clutch 79, 80, the rotatable drive sleeve 81 keyed in sliding relation with the tubular drive shaft or sleeve 99 by which the tool chuck 100 is carried, and as a result the tubular drive shaft 99 which is threadedly connected at 124 to the feed screw is rotated and fed axially at a fast speed relative to the then stationary feed screw. After the drilling tool is suitably positioned relative to the working face, the drilling implement 101 is connected to the drive shaft 99 by means of the chuck 100. The clutch lever 127 is then again manipulated and swung to the position wherein the levers 133 and 133a move inwardly into engagement with the grooves 131 and 131b as shown in Fig. 13 and the drill and feed clutches 79, and 104, 105 respectively are then both automatically applied by the coiled springs 94 and 115 respectively. As a result, both the sleeve member 81 and the tubular sleeve 106 are respectively driven through the gearing 74, 77, and 75, 102 and consequently both the drive member 99 and the feed screw 121 are rotated at different speeds in the same direction'. As the gears 77 and 102 are of different size, the sleeve 8l is rotated at a diiferential speed with respect to the feed screw 121, the gearing being so proportioned that when the gears 77 and 102 are simultaneously rotated the tubular drive sleeve 99 rotates at a speed faster than the speed of rotation of the feed screw 121 and as a result the tubular member 99 is fed slowly outwardly relative to the feed screw, thereby feeding the drilling implement into the work at a relatively slow speed. After the shot hole in the coal face is completed, the operator turns the cam disc 130 into the position wherein the lever 1338L isl swung outwardly, thereby releasing the drill clutch 79, 80 while the feed clutch 104, 105 is still applied and as a result the feed screw 121 is rotated relative to the then non-rotating drive sleeve 99 and consequently the tubular drive sleeve 99 is fed rearwardly at a relatively high speed and moving the cutting tool rearwardly therewith. During the drilling operation, if any unduly hard material is encountered by the drilling implement, for instance a. sulphur ball, rotation of the drilling implement is resisted and when the resistance to rotation exceeds a predetermined degree the drill clutch 79, 80 automatically slips and as a result when the speed of rotation of the drive member 81 becomes slower, than the speed of rotation of the feed screw 121 and the drilling implement is automatically retracted from the face due to the differential action between the two drive elements. When the drilling implement is again free to rotate, the speed of rotation of the member 81 automatically increases and the drilling implement is again advanced toward the work at a slow speed until it is again resisted by the work, this operation being repeated until the relatively hard material is penetrated. It is therefore obvious that the possibility of tool breakage is materially diminished. If it is desired to swing the drilling tool about the axis of the tubular supporting arm 50, the operator merely releases the positive lock 170, 174 and rotates the worm 166 and worm gear 164, thereby rotating the arm 50 relative to the casing 54 within its bearings 52 and 53. As the worm gearing 166, 164 is self-locking, the tubular arm is held in its different adjusted positions thereby, this self-locking feature being supplemented by the positive lock 170, 174. It will also be noted that when it is desired to swing the drill from the dotted line position shown in Fig. 19 to the full line position, this may be accomplished merely by swinging the casing 20 about the axis of the shaft 18, it being understood that the clamp 184, 180, 186 is first released. After the drilling operation is completed, the cutter. bar is again connected to the motor and the cutter chain actuated and the bar is then retracted from the face in a well-known manner, the mining machine and drill then being transported to a different working place. The drilling tool and machine operate in the same general manner during the insertion of a shear or vertical cut in the coal face. Various other adjustments and uses of the improved drilling tool will be clearly apparent to those skilled in this art.

While I have in this application specifically described one embodiment which this invention may assume in practice, it will be understood that this form of the same is shown for purposes of illustration and that the invention may be modied and embodied in various other forms without departing from its spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

1. In a drilling mechanism, a drilling implement, feeding and rotating mechanism for said implement including a drill clutch and a feed clutch, and operating means for said clutches including axially movable clutch applying members, pivoted shippermembers cooperating therewith, and means for swinging said shipper members to effect axial movement of said other members including reciprocable plungers guided for rectilinear movement on parallel axes at opposite sides of and parallel with the axis of said mechanism, said plungers respectively engaging said shipper members, and a common control element for selectively reciprocating said plungers.

2. In a drilling mechanism, a drilling implement, feeding and rotating mechanism for said implement including a drill clutch and a feed clutch, and operating means for said clutches including axially movableclutch applying members, pivoted shipper members cooperating therewith, and means for swinging said shipper members to effect axial movement of said other members including oppositely movable reciprocable plungers guided for rectilinear movement on parallel axes at opposite sides of and parallel with the axis of said mechanism, said plungers respectively engaging said shipper members, and a common control element for `selectively reciprocating said plungers.

3. In a drilling mechanism, a drilling implement, feeding and rotating mechanism for said implement including a drill clutch and a feed clutch, and operating means for said clutches including axially movable clutch applying members, pivoted -shipper members cooperating therewith, and means for swinging said shipper members to effect axial movement of said other members including reciprocable plungers guided for rectilinear movement on parallel axes at opposite sides of and parallel with the axis of said mechanism, said plungers reciprocably engaging said shipper members, means for actuating said plungers including pivoted levers one engaging each plunger, and a common control element for selectively swinging said levers about their pivots.

4. In a drilling mechanism, a drilling implement, feeding and rotating mechanism therefor including a drill clutch and a feed clutch, and operating means for saidclutches including axially movable clutch applying members, pivoted shipper members cooperating therewith, and means for swinging said shipper members to effect axial movement of said other members including parallel reciprocable plungers engaging said shipper members, means for actuating said plungers including pivoted levers, means for actuating said pivoted levers including parallel shafts arranged transversely to said plungers, and levers for actuating said shafts.

5. In a drilling mechanism, a support, and a drilling tool pivotally mounted on said support including a drill clutch and a feed clutch, and operating means for said clutches including a controlling element arranged coaxially with the axis of said tool pivot.

6. In a drilling mechanism, a support, and a drilling tool pivotally mounted on said support including a drill clutch and a feed clutch, and

. operating means for said clutches including a cam arranged coaxially with the axis of said tool support and cooperating elements actuated by said cam.

1. In a drilling mechanism, drill feeding and rotating mechanism including a plurality of clutches, pivoted shipper members, one for each clutch, actuating rods for said shipper members, and means for actuating said rods including levers, shafts for actuating said levers, levers for actuating said shafts, and cam means for swinging saiddast mentioned levers about their pivots.

8. In a clutch mechanism, a plurality of clutches, and operating means for said clutches including axially movable clutchapplying members, levers for actuating said members, plungers guided for rectilinear movement along longitudinal axes parallel with the clutch axes for actuating said levers. levers for reciprocating said plungers, and lever operated shafts arranged on axes lying in a transverse plane midway between said clutches for selectively operating said last mentioned levers.

9. In a clutch mechanism, a plurality of clutches, and operating means for said clutches including axially movable clutch applying members, levers for actuating said members, plungers guided for rectilinear movement along`longitudinal axes parallel with the clutch axes for actuating said levers, levers for reciprocating said plungers, lever operated shafts for operating said last mentioned levers, and a common actuating element for selectively actuating said shafts.

10. In a clutch mechanism, a plurality of clutches, and operating means for said clutches including axially movable clutch applying members, levers for' actuating said members, plungers for swinging said levers, levers for reciprocating said plungers, parallel shafts arranged at opposite sides of the clutch axes for swinging said last mentioned levers, and levers for rotating said shafts.

l1. In a clutch mechanism, a plurality of clutches, and operating means for said clutches including axially movable clutch applying members, levers for actuating said members, plungers for swinging said levers, levers forreciprocating tioned levers, separately operable levers for rotating said shafts, and a common actuating element for said last mentioned levers.

12. In a clutch mechanism, a pair of alined clutches, 'and operating means for said clutches including axially movable clutch applying members, pivoted shipper members cooperating with said clutch applying members, and means for swinging said shipper members to effect axial movement of said clutch applying members including reciprocable plungers guided for rectilinear movement on parallel axes at opposite sides of and parallel with the axes of said clutches, said plungers respectively engaging said shipper members and a common control element for selectively reciprocating said plungers.

13. In a clutch mechanism, a pair of alined clutches, and operating means for said clutches including axially movable clutch applying members, pivoted shipper members cooperating with said clutch applying members, means for swinging said shipper members to effect axial movement of said clutch applying members including reciprocable plungers guided for rectilinear movement on parallel axes at opposite sides of and parallel with the axes of said clutches. said plungers respectively vengaging said shipper members, and means for actuating said plungers including pivoted levers, one engaging each plunger and a common control element for selectively swinging said levers about their pivots.

14. In a clutch mechanism, a pair of alined clutches, and operating means for said clutches including axially movable clutch applying members, pivoted shipper members cooperating with said clutch applying members respectively, and

means for swinging said shipper members to effect axial movement of said other members including parallel reciprocable plungers respectively engaging said shipper members, means for actuating said plungers including pivoted levers, one engaging each plunger, and means for actuating said pivoted levers including parallel shafts arranged transversely of said plungers, and levers for respectively actuating said shafts.

15. In a clutch mechanism, a plurality of clutches, and operating means for said clutches including pivoted shipper members, one for each clutch, actuating rods for said shipper members respectively, and means for actuating said rods including levers, shafts for actuating said levers, levers for actuating said shafts, and cam means for swinging said last mentioned levers.

16. In a clutch mechanism, a plurality of alined clutches, and operating means for said clutches including pivoted shipper members, one for each clutch, and parallel plungers arranged with their axes parallel with and at opposite sides of the clutch axes and respectively cooperating with said shipper members.

17. In a clutch mechanism, a plurality of alined clutches, and operating means for said clutches including pivoted shipper members, one for each clutch, and parallel plungers arranged with their axes parallel with and at opposite sides of the clutch axes and respectively cooperating with said shipper members, and means for actuating said plungers including parallel shafts arranged at opposite sides of the clutch axes and at right angles to the plunger axes.

18. In a clutch mechanism, a support, a clutch housing swiveled on said support, a pair of clutches in said housing, and means for operating said clutches from the exterior of said housing including a controlling element mounted on said support coaxial with the clutch housing swivel.

19. In a clutch mechanism, a support, a clutch housing swiveled on said support, a .pair of clutches in said housing, and means for operating said clutches from the exterior of said housing including a cam mounted on said support coaxial with the clutch housing swivel, and cooperating elements actuated by said cam and operatively connected to said clutches respectively.

20. In a clutch mechanism, a plurality of clutches, and operating means for said clutches including axially movable clutch applying members, springs for normally urging said members into clutch applying position, and means for moving said members against the tension of said springs into their clutch releasing position including levers for respectively actuating said members, plungers guided for rectilinear movement on axes parallel with the clutch axes for respectively actuating said levers, levers for reciprocating said plungers and lever operated shafts for selectively operating said last mentioned levers.

21. In a clutch mechanism, a plurality of clutches, and operating means for said clutches 'including axially movable clutch applying members, springs for normally urging said members into clutch applying position, and means for moving said members against the tension of said springs into their clutch releasing position including pivoted shipper members respectively cooperating with said clutch applying members, and means for swinging said shipper members including reciprocable plungers guided for rectilinear movement on parallel axes at opposite sides of and parallel with the clutch axes, said plungers respectively engaging said shipper members.

23. In a clutch mechanism, a pair of alined clutches, and operating means for said clutches including axially movable clutch applying members, springs for normally urging said members into clutch applying position, and means for' moving said members against the tension of said springs into their clutch releasing position including pivoted shipper members respectively coopoperating with said clutch -applying members, means for swinging said shipper members including reciprocable plungers guided for rectilinear movement on axes parallel with the clutch axes respectively engaging said shipper members, and means for selectively actuating said plungers including pivoted levers, one engaging each plunger.

MORRIS P. HOLMES. 

